2D sheet to 1D rod-like morphology regulated self-assembled ZnCo2O4 microstructures under mixed solvent conditions for battery-type supercapacitors

Suggana, Pavani; Kumar, E. Praveen; Reddy, K. Chandrasekhar; Lakshmaiah, M.V.; Joo, Sang Woo; Raju, B. Deva Prasad

doi:10.1016/j.colsurfa.2023.131423

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…30 As the dielectric constant and solvent viscosity change during the reaction, the rate of diffusion and nucleation of the ZCO nanostructures were also impacted, resulting in the formation of ZCO crystals with different cation distributions. 34 These findings are in good agreement with the reported results. 34,35 Raman spectroscopy was conducted to further verify and analyze the spinel structures of prepared ZCO-NF samples.…”

Section: Microstructures and Characterization Of Zco Nanoflakessupporting

confidence: 92%

“…34 These findings are in good agreement with the reported results. 34,35 Raman spectroscopy was conducted to further verify and analyze the spinel structures of prepared ZCO-NF samples. The results are displayed in Figure 2.…”

Section: Microstructures and Characterization Of Zco Nanoflakessupporting

confidence: 92%

“…This difference can be attributed to the change in the cation distribution at tetrahedral sites . The different cation distributions of ZCO-NF samples are attributed to the effects of characteristics of mixed solvent on the nucleation and crystal growth processes of ZnCo 2 O 4 nanostructures. ,, Herein, the EG molecules not only acted as solvent but also served as a strong chelating agent to metallic cations . As the dielectric constant and solvent viscosity change during the reaction, the rate of diffusion and nucleation of the ZCO nanostructures were also impacted, resulting in the formation of ZCO crystals with different cation distributions .…”

Section: Resultsmentioning

confidence: 99%

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Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo₂O₄ Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

et al. 2023

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The recent advancement in designing novel spinel nanostructures has opened virtually infinite possibilities for the development of high-performance electrochemical sensors to detect target species. The electrocatalytic activity of spinel structures can be enhanced by tuning the cation distribution; however, the role of cation distribution at tetrahedral ions on the electrochemical sensing responses has rarely been considered. Herein, the effect of cation distribution at tetrahedral sites (T d ) in the spinel nanostructure ZnCo 2 O 4 on the electrochemical sensing performance toward carbaryl (CBR) was first investigated. The ZnCo 2 O 4 nanoflake samples with different cation ratios of Zn/Co at tetrahedral sites were designed by using a facile solvothermal method. We found that a higher Zn ion content at tetrahedral sites significantly enhanced the electron transfer ability through the electrolyte/electrode interface. More interestingly, a higher Co ion ratio between octahedral sites and tetrahedral (Co Oh /Co Td ) promoted the electrochemical oxidation process of CBR with a higher catalytic rate constant (k cat ). Under optimized conditions, the ZnCo 2 O 4 -NF-based electrochemical nanosensor showed a linear response from 0.15 to 100 μM with a limit of detection of 0.05 μM and a high electrochemical sensitivity of 2.04 μA μM −1 cm −2 . The designed nanosensor also exhibited good repeatability, long-time stability, high anti-interference ability, and excellent recovery with fruit and vegetable samples. Furthermore, this study offers insights into the cation distribution-dependent electrocatalytic activities of spinel nanostructures, which is helpful to the design of advanced spinel nanostructure-based electrocatalysts for improving the electrochemical sensing performance.

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Section: Microstructures and Characterization Of Zco Nanoflakessupporting

confidence: 92%

Section: Microstructures and Characterization Of Zco Nanoflakessupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

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Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo₂O₄ Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

et al. 2023

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“…The increased pore volume of the ZCO 1.5−4 and ZCO 2.0−4 samples helps ease electrolyte diffusion in the active material, derogating the resistance and mitigating volume expansion on the charge/discharge cycles. 18 Figure 5a 16,27 This observation strongly supports the batterytype electrode behavior, as illustrated by the preceding equations 28…”

Section: ■ Results and Discussionsupporting

confidence: 79%

“…Figure a compares the CV curves for the four ZCO electrodes, recorded at a potential window of −0.2 to 0.7 V versus Ag/AgCl used at 25 mV s –1 . All the electrodes displayed distinct redox peaks in their CV curves, contributing to M–O/M–O–O–OH’s reversible faradaic redox reactions (where M represents Zn and Co ions) in the presence of OH – anions. , This observation strongly supports the battery-type electrode behavior, as illustrated by the preceding equations − …”

Section: Results and Discussionsupporting

confidence: 76%

Investigation of Zn-to-Co Chemometric Ratio in Zinc Cobaltite Spinel as Battery-Type Superior Redox-Active Electrodes for Hybrid Supercapacitors: Density Functional Theory Analysis

Prasad,

Dilip Borse,

Rajasekhara Reddy

et al. 2024

J. Phys. Chem. C

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Engineering nonstoichiometric metal ions in the binary metal oxides is gaining importance in electrochemical energy storage and conversion devices. Zinc cobaltite (ZnCo 2 O 4 ), a p-type spinel structure, has been stringently applied in these fields. In this work, the chemometric ratios of metal ions (Zn and Co) are varied, and the impact of this nonstoichiometry on the electronic structure-modified ZnCo 2 O 4 and its effect on the electrochemical properties are studied in detail. The experiment uses the microwave-assisted hydrothermal method to vary the metal precursor to get the desired nonstoichiometry between Zn and Co in the ZnCo 2 O 4 binary metal oxides. A set of four different samples is prepared by varying the Zn−Co precursor stoichiometric concentrations as 0.5−4, 1.0−4, 1.5−4, and 2.0−4, respectively. These four ZCO samples are first confirmed by X-ray diffraction analysis, followed by refining the structures to determine the nonstoichiometries of the elements and supported by X-ray photoelectron spectroscopy. Density functional theory is applied to determine the electronic structure of ZnCo 2 O 4 with fully stoichiometric (bulk or no vacancy), three different, single-atom (Zn−, O−)-and dual atom (Zn− and O−)-deficient ZnCo 2 O 4 and compared. Among four samples, ZCO-1.5−4 and ZCO-2.0−4 are constructed in a hybrid supercapacitor device for practical application. The optimum ZCO-1.5−4 with Zn-and O-deficiency electrodes has shown better specific capacity (312.5 C g −1 at 1 A g −1 ), energy density (49.4 W h kg −1 ), and power density (10.168 kW kg −1 ) than other electrodes. Therefore, the work will provide a database for constructing various chemometric ratios of binary metal oxides for achieving optimized nonstoichiometry for the enhanced electrochemical performance of the practical device.

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Formation of MWCNT/LiCo2O4 nanoplates and their application for hybrid supercapacitor

Bhagwan,

Han

2024

Ceramics International

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2D sheet to 1D rod-like morphology regulated self-assembled ZnCo2O4 microstructures under mixed solvent conditions for battery-type supercapacitors

Cited by 7 publications

References 34 publications

Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo₂O₄ Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo₂O₄ Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

Investigation of Zn-to-Co Chemometric Ratio in Zinc Cobaltite Spinel as Battery-Type Superior Redox-Active Electrodes for Hybrid Supercapacitors: Density Functional Theory Analysis

Formation of MWCNT/LiCo2O4 nanoplates and their application for hybrid supercapacitor

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2D sheet to 1D rod-like morphology regulated self-assembled ZnCo2O4 microstructures under mixed solvent conditions for battery-type supercapacitors

Cited by 7 publications

References 34 publications

Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo2O4 Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo2O4 Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

Investigation of Zn-to-Co Chemometric Ratio in Zinc Cobaltite Spinel as Battery-Type Superior Redox-Active Electrodes for Hybrid Supercapacitors: Density Functional Theory Analysis

Formation of MWCNT/LiCo2O4 nanoplates and their application for hybrid supercapacitor

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Product

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Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo₂O₄ Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo₂O₄ Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples